Setts



(No Model.)

W. K. HODGMAN & N. H. CHENEY.

RACK TOOTH.

Patented June 14, 1887.

Fhcwmho m hu, Washington. 0. cv

FFICEO \VILLIS K. HODGMAN AND NORMAN H. CHENEY, OF TAUNTON, MASSACHU-SETTS, ASSTGNORS TO THE HUBER PRINTING PRESS COMPANY, OF SAME PLACE.

RACK-TOOTH.

SPECIFICATION forming part of Letters Patent No. 364,926, dated June 14,1887.

Application tiled November 26, 1886. Serial No. 219,896.

To aZZ whom it may concern:

Be it known that we, WILLIs K. HODGMAN and NORMAN H. CHENEY, both ofTaunton, county of Bristol and State of Massachusetts,

haveinvented an Improvement in Rack-Teeth,

of which the following description, in connection with the accompanyingdrawings, is a specification, like figures on the drawings representinglike parts.

IO This invention has for its object thei1nprovement of the end teeth ofthe reversing-rack, used in that class of mechanical movement commonlyknown as the Napier motion.

I11 the mechanical movement patented by I 5 Berthold Huber and \VillisK. Hodgmamdated August 24, 1886, No. 348,162, the end teeth of the racktherein shown are composed of shouldered bolts, attached to the rack bynuts, and provided with sleeves b, which are of substantially oval form,and are shorter than the bolts outside the said central guide, in orderthat the said sleeves may slide as well as rotate, as thereversing-gear, to be described, passes from the upper to thelower sideof the rack,

or vice versa. Our improvement consists in making thesaid sleeve in twoparts, the inner part being made in the form of a sphere and arranged toembrace and slide on a bolt, and the outer part being made in the formof a 3: cylinder and arranged to embrace and rock on the spherical innerpart.

Figure 1 is a longitudinal section of a rack- No model.)

tooth embodying our invention, on line A A, Fig. 2. Fig. 2 is a sectionon lineB B, Fig. 1.

The spherical part 3 of the tooth is madein 5 four pieces, cut, as shownin Fig. 2, so it can be placed in its hollow bearing in the eylindii calpart 2. The bolt 1 is held in position by the nut 4.

Operation: When the tooth is engaged by to the reversing-gear, inpassing from the upper to the lower side of the rack it accommodatesitself, as shown, to the rocking and slidingmotion of the said gear,thereby greatly reducing wear between the stud and reversing-gear.

Having fully described our invention, what we claim, and desire tosccureby Letters Patcut, is

1. A racktooth composed of a stud orbolt fitted with a sleeve made intwo parts, the

inner part being in the form of a hollow sphere and arranged to slideand turn 011 the stud, and the outer part being in the form of a hollowcylinder and arranged to rock on the spherical inner part, all combinedsubstan- 5 tially as described, for the purpose specified. 2. Thecombination of the stud 1 with the loose sleeve formed of the portionsinelosed one within the other, as set forth.

WILLIS K. HODGMAN. NORMAN H. CHENEY. Witnesses:

B. HUBER, E. P. COLEMAN.

